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Δ-DOR navigation has been used by number of NASA planetary missions. Other space agencies have also used the technique, on missions such as: ESA used a Δ-DOR system for Venus Express' orbit insertion in April 2006 and to Rosetta's Mars swingby in February 2007. The technique was also used in guiding the ExoMars Trace Gas Orbiter during its ...
Delta Force bodyguards in civilian clothing providing close protection to General Norman Schwarzkopf during the Gulf War, 1991. Delta Force was created in 1977 after numerous well-publicized terrorist incidents led the U.S. government to develop a full-time counter-terrorism unit. Key military and government figures had already been briefed on ...
Relativistic rocket means any spacecraft that travels close enough to light speed for relativistic effects to become significant. The meaning of "significant" is a matter of context, but often a threshold velocity of 30% to 50% of the speed of light (0.3 c to 0.5 c) is used. At 30% c, the difference between relativistic mass and rest mass is ...
The Yukon–Kuskokwim Delta is a river delta located where the Yukon and Kuskokwim rivers empty into the Bering Sea on the west coast of the U.S. state of Alaska. At approximately 129,500 square kilometers (50,000 sq mi) in size, [1] it is one of the largest deltas in the world. [2] [3] It is larger than the Mississippi River Delta (which ...
An inexact differential or imperfect differential is a differential whose integral is path dependent. It is most often used in thermodynamics to express changes in path dependent quantities such as heat and work, but is defined more generally within mathematics as a type of differential form. In contrast, an integral of an exact differential is ...
Website. c-tran.com. An older type of C-Tran bus (a 1982 General Motors RTS, a type now retired from the agency's fleet) at the Parkrose-Sumner Transit Center in Portland. A C-Tran Gillig Phantom in a later paint scheme. The agency still operates high-floor buses of this type, but has been gradually replacing them with low-floor models.
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